gdb: some int to bool conversion

When building GDB with clang 16, I got this,

  CXX    maint.o
maint.c:1045:23: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion]
      m_space_enabled = 1;
                      ^ ~
maint.c:1057:22: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion]
      m_time_enabled = 1;
                     ^ ~
maint.c:1073:24: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion]
      m_symtab_enabled = 1;
                       ^ ~
3 errors generated.

Work around this by using bool bitfields instead.

Tested by rebuilding on x86_64-linux with clang 16 and gcc 12.

Approved-By: Tom Tromey <[email protected]>

Author: lienze

gdb/maint.c

@@ -1042,25 +1042,25 @@ scoped_command_stats::scoped_command_stats (bool msg_type)
 #ifdef HAVE_USEFUL_SBRK
       char *lim = (char *) sbrk (0);
       m_start_space = lim - lim_at_start;
-      m_space_enabled = 1;
+      m_space_enabled = true;
 #endif
     }
   else
-    m_space_enabled = 0;
+    m_space_enabled = false;
 
   if (msg_type == 0 || per_command_time)
     {
       using namespace std::chrono;
 
       m_start_cpu_time = run_time_clock::now ();
       m_start_wall_time = steady_clock::now ();
-      m_time_enabled = 1;
+      m_time_enabled = true;
 
       if (per_command_time)
 	print_time (_("command started"));
     }
   else
-    m_time_enabled = 0;
+    m_time_enabled = false;
 
   if (msg_type == 0 || per_command_symtab)
     {
@@ -1070,10 +1070,10 @@ scoped_command_stats::scoped_command_stats (bool msg_type)
       m_start_nr_symtabs = nr_symtabs;
       m_start_nr_compunit_symtabs = nr_compunit_symtabs;
       m_start_nr_blocks = nr_blocks;
-      m_symtab_enabled = 1;
+      m_symtab_enabled = true;
     }
   else
-    m_symtab_enabled = 0;
+    m_symtab_enabled = false;
 
   /* Initialize timer to keep track of how long we waited for the user.  */
   reset_prompt_for_continue_wait_time ();

gdb/maint.h

@@ -49,9 +49,9 @@ class scoped_command_stats
   /* Track whether the stat was enabled at the start of the command
      so that we can avoid printing anything if it gets turned on by
      the current command.  */
-  int m_time_enabled : 1;
-  int m_space_enabled : 1;
-  int m_symtab_enabled : 1;
+  bool m_time_enabled : 1;
+  bool m_space_enabled : 1;
+  bool m_symtab_enabled : 1;
   run_time_clock::time_point m_start_cpu_time;
   std::chrono::steady_clock::time_point m_start_wall_time;
   long m_start_space;